BOUNDARY

 

Description: The BOUNDARY CARDS functions create and verify constraints and loads on finite element models.  The functions in the BOUNDARY CARDS MENU are organized as follows.

 

Usage:                                           

1.  DSI prompts:

>   SELECT OPTION

 

 

Note:  All of these options share this standard submenu.  The submenu yields varying ways to access and create definition cards for the above BOUNDARY CARDS.

>   CREATE

•    Defines a new card.

    DELETE

     Deletes a selected card or cards from those displayed in a pop-up window.

LIST

     Lists the cards in the option's database via pop-up window.

MODIFY

        Similar to the CREATE command, this command lists the defined cards in a pop-up window and allows the user to select and modify them.

EXIT

 

-BOUNDARY CARDS: ACOUSTIC COUPLING

 

Description: This function defines acoustic coupling boundary conditions for a thermal or coupled thermal/structural analysis.  Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: AMBIENT EOS

 

Description: This function defines ambient Equation of State boundary conditions for a thermal or coupled thermal/structural analysis. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: CONVECTION

 

Description: This function defines convection boundary conditions for a thermal or coupled thermal/structural analysis.  Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: CYCLIC

 

Description: These boundary conditions can be used to model a segment of an object that has rotational symmetry, such as an impeller.  The segment boundaries may be curved or planar. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: ELEMENT METHOD

 

Description: This function defines element method boundary conditions. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: FLUX

 

Description: This function defines flux boundary conditions for a thermal or coupled thermal/structural analysis. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: MCOL

 

Description: This function defines MCOL boundary conditions. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: NON-REFLECTING

 

Description: This function defines a non-reflecting boundary.  The option applies to continuum domains modeled with solid elements, as indefinite domains are usually not modeled. For geomechanical problems, this option is important for limiting the size of the models. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: NON-REFLECTING2D

 

Description: This function defines a non-reflecting boundary.  The option applies to continuum domains modeled with two-dimensional solid elements in the XY plane, as indefinite domains are usually not modeled.  For geomechanical problems, this option is important for limiting the size of the models.  Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: OUTFLOW CFD

 

Description: This function defines outflow CFD boundary conditions. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: PRESCRIBED CFD

 

Description: This function defines prescribed CFD boundary conditions. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: PRESCRIBED MOTION

 

Description: This function defines an imposed nodal motion (velocity, acceleration, or displacement) on a node or a set of nodes.  Also, velocities and displacements can be imposed on rigid bodies.  If the local option is active, the motion is prescribed with respect to the local coordinate system for the rigid body. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: PRESCRIBED ORIENTATION

 

Description: This function defines an imposed orientation for a rigid body. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: PRESSURE CFD SET

 

Description: This function defines pressure CFD set boundary conditions. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: PRESSURE OUTFLOW

 

Description: This function defines pressure outflow boundary conditions.  These boundary conditions are attached to solid elements using the Eulerian ambient formulation and defined to be pressure outflow ambient elements. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: RADIATION

 

Description: This function defines radiation boundary conditions for a thermal or coupled thermal/structural analysis. The preceding commands yield varying definition cards.  Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: SLIDING PLANE

 

Description: This function defines a sliding symmetry plane.  The option applies to continuum domains modeled with solid elements.  Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: SPH

 

Description: this function is used to define cards for SPH (Smooth Particle Hydrodynamics)

                               

-BOUNDARY CARDS: SPC

 

 

Description: This function defines nodal single point constraints.  After selecting CREATE/NODE, DSI displays the following dialogue box.  Once the DOF is determined in the dialogue box, DSI prompts the user to select the nodes.  DONE finishes the selection and displays the nodes with their SPC set number.

 

          

The options in the top and bottom of the SPC DEGREE OF FREEDOM box represent alternate methods for defining the degree of freedom. Only the top or the bottom can be selected, not both.

 

X-Y SYMMETRY                  Assigns symmetric boundary conditions to the XY plane.

Y-Z SYMMETRY                  Assigns symmetric boundary conditions to the YZ plane.

X-Z SYMMETRY                  Assigns symmetric boundary conditions to the XZ plane.

X-Y ANTI-SYMMETRY         Assigns asymmetric boundary conditions to the XY plane.

Y-Z ANTI-SYMMETRY          •.Assigns asymmetric boundary conditions to the YZ plane.

X-Z ANTI-SYMMETRY         • Assigns asymmetric boundary conditions to the XZ plane.

X 每 TRANSLATION             X-translation will be constrained.

Y 每 TRANSLATION             Y-translation will be constrained.

Z 每 TRANSLATION              Z-translation will be constrained.

X 每 ROTATION                   X-rotation will be constrained.

Y 每 ROTATION                    Y-rotation will be constrained.

Z 每 ROTATION                    Z-rotation will be constrained.

 

-BOUNDARY CARDS: SYMMETRY FAILURE

 

Description: This function defines a symmetry plane with a failure criterion.  This option applies to continuum domains modeled with solid elements. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: TEMPERATURE

 

Description: This function defines temperature boundary conditions. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: THERMAL WELD

 

Description: This function defines thermal weld boundary conditions. Refer to the LS-DYNA User's Manual for further description.

 

-BOUNDARY CARDS: USA

 

Description: This function defines USA boundary conditions. Refer to the LS-DYNA User's Manual for further description.